hitbtc is selling IOU ( The term "IOU" is an abbreviation, in phonetic terms, of "I owe you.") , real tezos ICO tokens are not distributed yet. Hitbtc has a price of usd $2 per IOU - that is aprx. 5x ICO price. When real tokens hit the market this price could be meaningless..or not 
its really exciting, but did hitbtc involved in the ico? how can it sell IOU if it has no real token when distributed